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measure of cloud ceilingclick to hear

Cloud ceiling: altitude of the base of the clouds, expressed in feet.
measure of cloud ceiling ceiling projector theodolite alidade

ceiling projector click to hear

Spotlight whose point of luminous impact on a cloud serves as a reference for an alidade or theodolite sighting.

theodolite click to hear

Instrument used to measure angles whose intervals indicate the height of a given point in relation to another.

alidade click to hear

Instrument whose sighting axis, by moving along a calibrated circle, measures a cloud’s angle in relation to the horizon, and thus its height.